I have 3 estimotes that I can use their app to define the distance to broadcast the signal and how often it is signaling. The reason iViri doesn't allow for distance is because the API is very restrictive on the apple side, meaning they just report back Immediate, Far, Near, etc.... and there is no way to actually give an exact 5ft, 10ft, etc... So with how many different beacons out there, I decided that most of them allow you to change their distance that the user should control it on the beacon side and not in the app as there is no good control for it and I know I would be spending more time on enhancements in the app for this than I have the time for. iBeacons is are not a science just yet but hopefully apple continues with the technology and enhances the developers capabilities around it.